Bilic has been left baffled, telling Nova TV: “The money in football is absurd in context of 'normal' people, it has been that way for some time and it shouldn't be like that.

“But it is like that in other sports and also in show business.

“You have Bieber who is earning a lot more than Rolling Stones, not to mention Led Zeppelin or Elvis Presley. Everything cracked, nothing is normal anymore.”

While questioning the money being generated and spent by football clubs around the world, Bilic has paid homage to one of those splashing the cash.

Jose Mourinho has already spent big at Manchester United, with there the promise of more additions to come at Old Trafford.

He has been forced to bolster his ranks in an effort to mount a Premier League title challenge, having faced questioning in 2016-17 despite landing three trophies in his debut campaign with the Red Devils.